下面的代码将命令行参数作为输入,并使套接字准备好侦听来自客户端的传入数据包,但是它在某个阶段没有运行,因为通过命令行输入的端口号没有获取同样,
请指出可能存在的错误
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include "p8log.h"
#include <errno.h>
#define FIRST_SIZE 1
#define SECOND_SIZE 6
#define THIRD_SIZE 16
int main(int argc, char* argv[])
{
/*some code*/
if (fd != NULL)
{
struct sockaddr_in serverAddr, clientAddr;
struct sockaddr_storage serverStorage;
socklen_t addr_size, client_addr_size;
/*Create UDP socket*/
udpSocket = socket(PF_INET, SOCK_DGRAM, 0);
if (udpSocket==-1)
LERR("Error in creating the socket with the error number <%s>",strerror(errno) );
/*Configure settings in address struct*/
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons((int)*PORT);
serverAddr.sin_addr.s_addr = inet_addr(IPADDR);
memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);
/*Bind socket with address struct*/
return 0;
}
Execution of the program:
./a.out 11111 127.0.0.1
Output:
Arg Count=3
Arguments are=./UDPserver,11111,127.0.0.1
port num=11111
IP ADDR=127.0.0.1
客户端代码:
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#define PORT 11111
#define IPADDR "127.0.0.1"
int main(){
/*some code*/
}
答案 0 :(得分:2)
在您的服务器中,PORT
是char*
。
当您传递“11111”时,*PORT
(a.k.a。PORT[0]
)为'1'
,而(int)*PORT
最有可能为49。
您需要使用例如atoi
转换为整数。